Thermometer



Feb. 14, 1933. H. Y. NORWOOD THERMOMETER Filed April 30, 1931 $V EkINVENTOR a 0% I W A E TQRNEY Patented Feb. 14, 1933 UNITED STATES rarer@FFEQE HARRY Y. NORWOOD, OF WEST RUSH, NEW

YORK, ASSIGNOR TO TAYLOR INSTRUMENT COMPANIES, OF ROCHESTER, NEW YORK, ACORPORATION OF NEW YORK THERLIOMET'ER Application filed April 30,

This invention relates to mercury thermometers and more in particular tothermometers of the type used in industrial establishments.

It is the object of the invention to provide a thermometer which can beeasily read both by reflected light and by transmitted light.

The characteristics of the invention and its advantages will be fullyunderstood in connection with the accompanying drawing which forms partof the specification.

In the drawing Fig. 1 is a front View of a thermometer embodying theinvention;

Fig. 2 is a longitudinal section through so much of the thermometershown in Fig. l as constitutes part of the invention;

Fig. 3 is a rear View of the thermometer shown in Fig. 1, a part beingomitted; and

Fig. 4 is a cross section on line d-t, Fig. 3.

Having reference to the drawing, 1 is the thermometer stem, the bulb ofwhich is seated in the usual way in the bulb chamber or well 2. Themechanical detail including the 5 chamber 2, vrenoh-head 3, bottom laoithe casing at, etc. do not form any part of the invention and may beassumed to corresepond to a usual form of construction.

The casing 4 includes an upper section ll) and a lower section etagenerally V-shaped in cross section, as shown in Fig. 4:, and a centralsection dd which has an opening to the rear, covered by a translucentscreen 5.

The thermometer stem 1 lies in or slightly in front of the crotch of theV of sections 4?) and do. At the lower end of section 46 and at theupper end of section do are provided ledges 6 increasing in heighttoward the center. These ledges which do not extend to the center butleave a gap to accommodate the stem 1, are provided to support milkglass scale portions 7a and 7 b which are held in position by clasps 8.Clasps 8 are mounted for sliding adjustment on the surfaces of thesections 46 and to by means of slots 80; and screws 85. By thisarrangement the scales may be accurately adjusted relatively to thestem. The gripping portions 80 of the clasps overlie the ends of thescale glasses and the 50 inner edges of the portions 80 form abut- 1931.Serial No. 533,877.

ments for the stem 1 so that the latter is centered and confined againstlateral and forward movement. The inner edges of the scale glasses maybe adjusted to lie close against the stem whereby the scale divisionsare brought. into close reading relation to the mercury column of thethermometer.

. The front of the casing is covered by the usual form of glass cover 9.

While the thermometer described may be equally well read by reflectedand by transmitted light, it is especially adapted for reading bytransmitted light. Light transmitted through the translucent screenpasses through both thestem and the milk-glass scales and thus makes themercury column stand out against the division lines of the scales withgreater clearness than could be obtained by reflected light.

I claim:

1. A thermometer comprising, in combination with'a mercury tube, asupport including an upper portion and a lower portion for receiving theopposite ends of the tubeand a middle portion having an opening towardthe rear, a translucent screen in said opening, and translucent scalemembers supported on said upper and lower portions and substantiallycoextensive with said middle. portion.

2. A thermometer comprising, in combination with a mercury tube, asupport including an upper portion and a lower portion substantiallyV-shaped in cross-section for receiving the opposite ends of the tubeand a middle portion having an opening toward the rear, a translucentscreen in said opening and translucent scale members supported on saidupper and lower portions and substantially coextensive with said middleportion,

said scale members abutting against the tube on opposite sides thereof.

3. A thermometer comprising, in combi nation with a mercury tube, asupport including an upper portion and a lower portion substantiallyV-shaped in cross-section for receiving the opposite ends of the tubeand a middle portion having an opening toward the rear, a translucentscreen in said opening, translucent scale members disposed on oppo-t,

site sides of the tube and means on the said upper and lower portionsfor adjustably holding the scale members, including means abuttingagainst the tube on opposite sides thereof to hold the latter againstlateral and against forward movement.

4. A thermometer comprising, in combination with a mercury tube, asupport including an upper portion anda lower portion substantiallyV-shaped in cross-section for receiving the opposite ends of the tubeand a middle portion having an opening toward the rear, a translucentscreen in said opening,

translucent scale members disposed on oppoe site sides of the tube,ledges on the said upper and lower portions for supporting the scalemembers and clasps adjustably mounted on the said upper and lowerportions for holding the scale members upon said ledges and means ontube to hold the latter against lateral and against forward movement. i

5. A thermometer comprising, in combination with a mercury tube, asupport ineluding an upper portion and a lower portion substantiallyV-shaped in cross-section for receiving the opposite ends of the tubeand a middle portion having an opening toward the rear, a translucentscreen in said opening, ledges on the said upper and lower portions onopposite sides of the tube, translucent scale members on said ledges andclasps adjustably mounted on the said upper and lower portions forholding the scale members upon the ledges and means on the clasps: forabutting with the tube to hold the latter against lateral and againstforward movement, .the

said ledges increasing in height toward the tube and the scale membersabutting against the tube. V I

In testimony whereof I affiX my signature.

- HARRY Y. NORWOOD.

the clasps for abutting with the

